Hiding the ActionBar on RecyclerView/ListView onSc

Question

In my application I got an activity with some kind of actionbar at the top and the listview below it. What I want to do - is to scroll it UP with the list, so it hides and then, when the list is being scrolled down - it should scroll down with the list, like it was just over the upper screen border. how can i achieve this functionality?

Answer 1

I have a thought that it is a good idea.

listView.setOnScrollListener(new OnScrollListener() {
    int mLastFirstVisibleItem = 0;

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
      switch (scrollState) {
            case OnScrollListener.SCROLL_STATE_FLING:
                if (view.getId()==lv_searchresult_results.getId()){
                final int currentFirstVisibleItem=lv_searchresult_results.getFirstVisiblePosition();
                    if(currentFirstVisibleItem>mLastFirstVisibleItem){

                    ObjectAnimator.ofFloat(toolbar, "translationY", -toolbar.getHeight()).start();
                    else if(currentFirstVisibleItem<(mLastFirstVisibleItem)){

                    ObjectAnimator.ofFloat(toolbar, "translationY", 0).start();
                    }
                    mLastFirstVisibleItem= currentFirstVisibleItem;
                }

                if(lv_searchresult_results.getLastVisiblePosition() == myAdapter.getListMap().size()){ 
                    if(myAdapter.getListMap().size() < allRows&&!upLoading){

                    }
                }
                break;
            case OnScrollListener.SCROLL_STATE_IDLE:

                if (view.getFirstVisiblePosition()<=1){
                    ObjectAnimator.ofFloat(toolbar, "translationY", 0).start();

                }
                    if(lv_searchresult_results.getLastVisiblePosition() == myAdapter.getListMap().size()){
                    if(myAdapter.getListMap().size() < allRows&&!upLoading){


                    }
                }
                break;